Gear pump for electric forklift

Abstract

The utility model provides a gear pump for an electric forklift, which comprises a pump body, a front pump cover is arranged at the front end of the pump body, a rear pump cover is arranged at the rear end of the pump body, a pump body inner cavity is formed between the front pump cover and the rear pump cover, a gear set is arranged between the front pump cover and the rear pump cover, and a liquid inlet cavity and a liquid outlet cavity are respectively formed on two sides of the gear set. A liquid inlet communicated with the liquid inlet cavity and a liquid outlet communicated with the liquid outlet cavity are formed in the side wall of the pump body; the gear set comprises a driving gear and a driven gear which are meshed with each other, driven connecting shafts at the two ends of the driven gear are rotationally installed on the front pump cover and the rear pump cover respectively, driving connecting shafts at the two ends of the driving gear are rotationally installed on the front pump cover and the rear pump cover respectively, and the driving connecting shaft, located on one side of the front pump cover, of the driving gear is provided with a connecting section extending outwards out of the front pump cover. And a shaft seal is arranged between the connecting section and the front pump cover. According to the gear pump, the front pump cover, the pump body and the rear pump cover are fixed through bolts, assembling and disassembling are very convenient, and the gear pump is stable and reliable during working and long in service life.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of forklift manufacturing, in particular to a gear pump for electric forklifts. BACKGROUND

[0002] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gear to transport liquid or increase the pressure. Two gears, a pump body and front and rear covers form two closed spaces. When the gears rotate, the volume of the space on the gear disengagement side changes from small to large, forming a vacuum that sucks in liquid, and the volume of the space on the gear engagement side changes from large to small, which squeezes the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of the two gears. The pressure of the gear pump outlet depends entirely on the size of the resistance at the pump outlet. The common gear pump in the prior art has high labor intensity in production and assembly, and has problems such as high noise and insufficient load carrying capacity during use. Therefore, it is necessary to improve the existing gear pump. SUMMARY

[0003] Therefore, the present application aims to overcome the defects in the prior art and provide a gear pump for electric forklifts.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] A gear pump for electric forklifts, comprising a pump body, a front pump cover at the front end of the pump body, and a rear pump cover at the rear end of the pump body, an outer sealing ring between the front pump cover and the pump body, and an outer sealing ring between the rear pump cover and the pump body; a gear set is arranged between the front and rear pump covers to form an inner cavity of the pump body, and an inlet chamber and an outlet chamber are formed on both sides of the gear set, an inlet port is arranged on the side wall of the pump body and communicates with the inlet chamber, and an outlet port is arranged on the side wall of the pump body and communicates with the outlet chamber.

[0006] The gear set comprises a driving gear and a driven gear that mesh with each other, and a driven connecting shaft at both ends of the driven gear is rotatably installed on the front and rear pump covers, respectively, and a driving connecting shaft at both ends of the driving gear is rotatably installed on the front and rear pump covers, respectively, and the driving connecting shaft on the side of the driving gear of the front pump cover has a connecting section that extends outward beyond the front pump cover, and an axial seal is arranged between the connecting section and the front pump cover.

[0007] The axial seal comprises a main body, a skeleton is arranged inside the main body, the main body comprises a matching portion on the outside and a sealing portion on the inside, the two are connected by a unilateral connecting portion, an annular deformation member is arranged between the matching portion and the sealing portion, an inner lip is arranged in the middle of the sealing portion, and an outer lip is arranged at the position of the sealing portion close to the connecting portion.

[0008] Furthermore, the front pump cover includes a front pump cover body and a front pump cover insert section, and the rear pump cover includes a rear pump cover body and a rear pump cover insert section. The outer sealing ring is provided between the front pump cover body and the pump body, and between the rear pump cover body and the pump body.

[0009] Furthermore, thrust plates are provided on both sides of the driving gear, and thrust plates are also provided on both sides of the driven gear.

[0010] Furthermore, an inner sealing ring is provided between the end face of the front pump cover insert section and its corresponding thrust plate, and between the end face of the rear pump cover insert section and its corresponding thrust plate.

[0011] Furthermore, the deformable component is a rubber ring.

[0012] Furthermore, the main body of the shaft seal is made of rubber material.

[0013] Furthermore, the diameter of the inlet is larger than the diameter of the outlet.

[0014] Furthermore, the front pump cover, pump body, and rear pump cover are fixed together by bolts.

[0015] Compared with existing technologies, the present invention has the following advantages:

[0016] The front pump cover, pump body, and rear pump cover of this invention are fixed with bolts, making assembly and disassembly very convenient. The gear set inside the pump body forms an inlet chamber and an outlet chamber on both sides. The pump body side wall is provided with an inlet port communicating with the inlet chamber and an outlet port communicating with the outlet chamber. The diameter of the inlet port is larger than the diameter of the outlet port, and the side wall of the outlet chamber is provided with a lateral inward groove, which can buffer the pumped oil, play a role in shock absorption and noise reduction, improve the stability of the gear pump during operation, and extend the service life of the gear pump to a certain extent. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the external shape created for this invention;

[0019] Figure 2 for Figure 1 The left view;

[0020] Figure 3 for Figure 1 The right view;

[0021] Figure 4 A structural cross-sectional view created for this invention;

[0022] Figure 5 A structural cross-sectional view of another direction of the present invention is created;

[0023] Figure 6 A structural schematic view of the central shaft seal of the present invention is created. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present invention and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

[0026] In the description of the present invention, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0028] A gear pump for electric forklift, such as Figures 1 to 6As shown, the pump comprises a pump body 1, a front pump cover 2 at the front end of the pump body, a rear pump cover 3 at the rear end of the pump body, an outer sealing ring 4 between the front pump cover and the pump body and between the rear pump cover and the pump body, the front pump cover, the pump body and the rear pump cover are fixed by bolts 5, which is very convenient for assembly and disassembly. The front pump cover and the rear pump cover form a pump cavity, and a gear set is arranged between the front pump cover and the rear pump cover, the gear set is provided with a liquid inlet cavity 6 and a liquid outlet cavity 7 on both sides, a liquid inlet 8 is arranged on the side wall of the pump body and communicates with the liquid inlet cavity, and a liquid outlet 9 is arranged on the side wall of the pump body and communicates with the liquid outlet cavity, the diameter of the liquid inlet is larger than that of the liquid outlet.

[0029] The gear set comprises a driving gear 10 and a driven gear 11 which are engaged with each other, a driving connection shaft at both ends of the driving gear is rotatably installed on the front pump cover and the rear pump cover, a driven connection shaft at both ends of the driven gear is rotatably installed on the front pump cover and the rear pump cover, and the driving connection shaft on the side of the driving gear away from the front pump cover has a connection section 12 which extends out of the front pump cover, and an axle seal 13 is arranged between the connection section and the front pump cover. A threaded hole is arranged at the free end of the connection section. Preferably, an elastic stop ring 14 is arranged on the inner wall of the axle hole of the front pump cover for the connection section, and the elastic stop ring is arranged on the outer side of the axle seal, that is, the elastic stop ring is closer to the free end of the connection section than the axle seal.

[0030] The axle seal comprises a main body, a skeleton 15 is arranged in the main body, and the skeleton can be made of spring steel as an example. The main body comprises a matching part 16 on the outer side and a sealing part 17 on the inner side, the two are connected by a unilateral connecting part 18, an annular deformation part 19 is arranged between the matching part and the sealing part, an inner lip 20 is arranged in the middle of the sealing part, and an outer lip 21 is arranged on the side of the sealing part close to the connecting part.

[0031] In an optional embodiment, the cross section of the liquid inlet cavity and the cross section of the liquid outlet cavity are both substantially semicircular, and an arc-shaped lateral inner recess 22 is arranged on the side of the semicircular cavity of the liquid outlet cavity away from the liquid inlet cavity. As an example, the bottom inner recess is an arc-shaped groove. With such a structure, when the oil is pressed from the liquid inlet cavity into the liquid outlet cavity by the gear shaft, the oil will flow into the lateral inner recess of the liquid storage cavity along the side wall of the liquid inlet cavity, the curvature of the lateral inner recess is smaller than the diameter of the inner cavity of the liquid outlet cavity, and the oil will be buffered when entering the lateral inner recess, so that the vibration and noise of the gear pump can be reduced to a certain extent.

[0032] The front pump cover comprises a front pump cover main body and a front pump cover plug-in section 23, the rear pump cover comprises a rear pump cover main body and a rear pump cover plug-in section 24, and the outer sealing ring is arranged between the front pump cover main body and the pump body and between the rear pump cover main body and the pump body. The deformation part is made of a rubber ring. The main body of the axle seal is made of rubber material.

[0033] Generally, the driving gear is provided with a thrust piece 25 on each side, and the driven gear is also provided with a thrust piece on each side. An inner sealing ring 26 is arranged between the end face of the front pump cover insertion section and the corresponding thrust piece, and between the end face of the rear pump cover insertion section and the corresponding thrust piece. By arranging the inner sealing ring and the outer sealing ring between the pump body and the front and rear pump covers, effective sealing can be formed.

[0034] The front pump cover, the pump body and the rear pump cover of the present application are fixed by bolts, and assembling and disassembling are very convenient. The gear set inside the pump body is provided with liquid inlet cavities and liquid outlet cavities on both sides, and the pump body side wall is provided with a liquid inlet communicating with the liquid inlet cavity and a liquid outlet communicating with the liquid outlet cavity. The diameter of the liquid inlet is larger than that of the liquid outlet, and the side wall of the liquid outlet cavity is provided with a lateral inner groove, which can buffer the pumped oil, reduce vibration and noise, improve the stability of the gear pump during operation, and prolong the service life of the gear pump to a certain extent.

[0035] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gear pump for an electric fork lift truck, characterized by: The pump body is provided with a front pump cover at the front end and a rear pump cover at the rear end, and outer sealing rings are arranged between the front pump cover and the pump body and between the rear pump cover and the pump body; the front pump cover and the rear pump cover form an inner cavity of the pump body, a gear set is arranged between the front pump cover and the rear pump cover, and liquid inlet and outlet cavities are formed on both sides of the gear set; a liquid inlet communicating with the liquid inlet cavity and a liquid outlet communicating with the liquid outlet cavity are arranged on the side wall of the pump body; the gear set comprises a driving gear and a driven gear which are engaged with each other, and the driving connection shafts at both ends of the driven gear are rotatably installed on the front and rear pump covers, and the driving connection shafts at both ends of the driving gear are rotatably installed on the front and rear pump covers; the driving connection shaft on the side of the driving gear of the front pump cover has a connection section extending out of the front pump cover, and an axle seal is arranged between the connection section and the front pump cover, the axle seal comprises a main body, a skeleton is arranged in the main body, the main body comprises a matching portion on the outside and a sealing portion on the inside, the two are connected through a unilateral connecting portion, an annular deformation member is arranged between the matching portion and the sealing portion, an inner lip is arranged in the middle of the sealing portion, and an outer lip is arranged on the position close to the connecting portion of the sealing portion.

2. The electric gear pump for a forklift truck according to claim 1, characterized by: The front pump cover comprises a front pump cover main body and a front pump cover plug-in section, the rear pump cover comprises a rear pump cover main body and a rear pump cover plug-in section, and the outer sealing rings are arranged between the front pump cover main body and the pump body and between the rear pump cover main body and the pump body.

3. The electrically driven gear pump for a fork lift truck according to claim 2, characterized in that: Thrust pieces are arranged on both sides of the driving gear and the driven gear.

4. The electrically driven gear pump for a fork lift truck according to claim 3, characterized in that: Inner sealing rings are arranged between the end face of the front pump cover plug-in section and the corresponding thrust piece and between the end face of the rear pump cover plug-in section and the corresponding thrust piece.

5. The electrically driven gear pump for a fork lift truck according to claim 1, characterized by: The deformation member is a rubber ring.

6. The electrically driven gear pump for a fork lift truck according to claim 1, characterized by: The main body of the axle seal is made of rubber material.

7. The electrically driven gear pump for a fork lift truck according to claim 1, characterized by: The diameter of the liquid inlet is greater than that of the liquid outlet.

8. A gear pump for electric fork lift trucks according to any one of claims 1 to 7, characterized in that: The front pump cover, the pump body and the rear pump cover are fixed through bolts.

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